Global Patent Index - EP 0880311 A1

EP 0880311 A1 19981125 - ELECTROMAGNETIC FIELD SHIELDING DEVICE

Title (en)

ELECTROMAGNETIC FIELD SHIELDING DEVICE

Title (de)

SCHUTZVORRICHTUNG VOR ELEKTROMAGNETISCHEN FELDERN

Title (fr)

DISPOSITIF DE PROTECTION CONTRE LES CHAMPS ELECTROMAGNETIQUES

Publication

EP 0880311 A1 19981125 (EN)

Application

EP 97942249 A 19971003

Priority

  • JP 9703556 W 19971003
  • JP 26427496 A 19961004

Abstract (en)

The electromagnetic field shielding apparatus of the present invention includes the electromagnetic field detection coil 21 for detecting an AC leakage electromagnetic field and the parallel resonance circuit 22-24 whose circuit constants are predetermined so that the resonance frequency matches the frequency of the electromotive force induced by the electromagnetic field detection coil 21. The resistor 24 of the parallel resonance circuit 22-24 consumes energy so that the strengths of the magnetic and electrical fields passing through the electromagnetic field detection coil 21 are suppressed. <IMAGE>

IPC 1-7

H05K 9/00

IPC 8 full level

G01R 1/18 (2006.01); G01R 29/08 (2006.01); H01J 29/00 (2006.01); H01Q 1/52 (2006.01); H04B 15/00 (2006.01); H04N 5/645 (2006.01)

CPC (source: EP US)

G01R 1/18 (2013.01 - EP US); G01R 29/0814 (2013.01 - EP US); H01J 29/003 (2013.01 - EP US); H01Q 1/526 (2013.01 - EP US); H04B 15/00 (2013.01 - EP US); G01R 29/0878 (2013.01 - EP US); H01J 2229/0023 (2013.01 - EP US); H04N 5/645 (2013.01 - EP US)

Designated contracting state (EPC)

DE FR GB NL

DOCDB simple family (publication)

EP 0880311 A1 19981125; EP 0880311 A4 20000809; EP 0880311 B1 20040414; DE 69728650 D1 20040519; JP 3176636 B2 20010618; US 6249006 B1 20010619; WO 9815161 A1 19980409

DOCDB simple family (application)

EP 97942249 A 19971003; DE 69728650 T 19971003; JP 50364898 A 19971003; JP 9703556 W 19971003; US 7739298 A 19980528